I've created a 3 fo 5 multisig wallet using the Mist browser. The first account was created in Mist, but the rest were on different computers (some offline) and I just typed in the public addresses in Mist when assigning owners.
So, now I'm trying to send Ether to The DAO, and I can only get the original Mist account to sign the transaction. I can't seemd to understand if MyEtherWallet will let me "Approve" the transaction from the Contract... and Jaxx won't even let me sign an arbitrary message let alone import an ABI.
So far it looks like I'll need Mist on each Computer and mobile signing will have to wait...